From the Super Mario Wiki, the Mario encyclopedia
Simian Spring is a special ability used by Diddy Kong from a Diddy Pad in Donkey Kong 64. Diddy can learn this ability after buying a potion from Cranky's Lab in Frantic Factory for seven Banana Bunch Coins.
When Diddy is standing on a Diddy Pad, the player can press to make him spring off the ground with his tail and perform a high jump, allowing him to reach higher areas.
The scientific name of Simian Spring is Leapus Largium, a play on the words "Leap" and "Large".
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